Proton Calendar

Secure encrypted calendar that keeps your schedule private

Proton Calendar is a polished, privacy-first planner that brings serious security to everyday scheduling without sacrificing usability. If you already live in your calendar, this tool feels both familiar and meaningfully safer.

The interface is clean and intuitive, offering daily, weekly, and monthly views that make it easy to switch between quick agenda checks and long-term planning. Creating events is straightforward, with support for recurring schedules (daily, weekly, monthly, yearly, or fully custom) and multiple reminders per event. Frequent travelers or remote workers will appreciate the ability to schedule in different time zones, reducing the risk of missed meetings.

A standout feature is the home screen widget, which gives you a clear snapshot of your agenda at a glance. Dark and light themes let you match the look to your system or personal preference, and power users on paid plans can manage up to 20 separate calendars to keep work, personal life, and side projects neatly organized.

Where Proton Calendar truly distinguishes itself is privacy. Events are protected with end-to-end and zero-access encryption, meaning even Proton cannot read your event titles, descriptions, or participant lists. There are no ads, no trackers, and no data sharing, and being based in Switzerland brings the added reassurance of strong local privacy laws and GDPR compliance.

The main limitations are that advanced multi-calendar management is locked behind a paid tier, and collaboration features are more restrained than in some productivity-focused services. However, for users who care about controlling their data and still want a capable, modern calendar, Proton Calendar strikes a compelling balance between security and practicality.